Regensburg 2004 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 50: Quantenpunkte und -dr
ähte: Optische Eigenschaften III
HL 50.1: Vortrag
Freitag, 12. März 2004, 11:00–11:15, H14
Optical Detection of Single-Electron Spin Decoherence in a Quantum Dot — •Oliver Gywat1, Hans-Andreas Engel1, Daniel Loss1, R.J. Epstein2, F. Mendoza2, and D.D. Awschalom2 — 1Department of Physics and Astronomy, University of Basel, Switzerland — 2Center for Spintronics and Quantum Computation, University of California, Santa Barbara, USA
We propose a method based on optically detected magnetic resonance (ODMR) to measure the decoherence time T2 of a single electron spin in a semiconductor quantum dot. The electron spin resonance (ESR) of a single excess electron on a quantum dot is probed by circularly polarized laser excitation. Due to Pauli blocking, optical excitation is only possible for one of the electron spin states. The photoluminescence is modulated due to the ESR which enables the measurement of electron spin decoherence. We study different possible schemes for such an ODMR setup. (cond-mat/0307669)